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ToDataTableTest.cs
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ToDataTableTest.cs
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#region License and Terms
// MoreLINQ - Extensions to LINQ to Objects
// Copyright (c) 2010 Johannes Rudolph. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
namespace MoreLinq.Test
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq.Expressions;
using NUnit.Framework;
[TestFixture]
public class ToDataTableTest
{
sealed class TestObject
{
public int KeyField;
public Guid? ANullableGuidField;
public string AString { get; }
public decimal? ANullableDecimal { get; }
public object Unreadable { set => throw new NotImplementedException(); }
public object this[int index] { get => new(); set { } }
public TestObject(int key)
{
KeyField = key;
ANullableGuidField = Guid.NewGuid();
ANullableDecimal = key / 3;
AString = "ABCDEFGHIKKLMNOPQRSTUVWXYSZ";
}
public override string ToString() => nameof(TestObject);
}
readonly IReadOnlyCollection<TestObject> _testObjects;
public ToDataTableTest() =>
_testObjects = Enumerable.Range(0, 3)
.Select(i => new TestObject(i))
.ToArray();
[Test]
public void ToDataTableNullMemberExpressionMethod()
{
Expression<Func<TestObject, object?>>? expression = null;
Assert.That(() => _testObjects.ToDataTable(expression!),
Throws.ArgumentException("expressions"));
}
[Test]
public void ToDataTableTableWithWrongColumnNames()
{
using var dt = new DataTable();
_ = dt.Columns.Add("Test");
Assert.That(() => _testObjects.ToDataTable(dt),
Throws.ArgumentException("table"));
}
[Test]
public void ToDataTableTableWithWrongColumnDataType()
{
using var dt = new DataTable();
_ = dt.Columns.Add("AString", typeof(int));
Assert.That(() => _testObjects.ToDataTable(dt, t => t.AString),
Throws.ArgumentException("table"));
}
[Test]
public void ToDataTableMemberExpressionMethod()
{
Assert.That(() => _testObjects.ToDataTable(t => t.ToString()),
Throws.ArgumentException("lambda"));
}
[Test]
public void ToDataTableMemberExpressionNonMember()
{
Assert.That(() => _testObjects.ToDataTable(t => t.ToString().Length),
Throws.ArgumentException("lambda"));
}
[Test]
public void ToDataTableMemberExpressionIndexer()
{
Assert.That(() => _testObjects.ToDataTable(t => t[0]),
Throws.ArgumentException("lambda"));
}
[Test]
public void ToDataTableMemberExpressionStatic()
{
Assert.That(() => _ = _testObjects.ToDataTable(_ => DateTime.Now),
Throws.ArgumentException("lambda"));
}
[Test]
public void ToDataTableSchemaInDeclarationOrder()
{
var dt = _testObjects.ToDataTable();
// Assert properties first, then fields, then in declaration order
Assert.That(dt.Columns[0].Caption, Is.EqualTo("AString"));
Assert.That(dt.Columns[0].DataType, Is.EqualTo(typeof(string)));
Assert.That(dt.Columns[1].Caption, Is.EqualTo("ANullableDecimal"));
Assert.That(dt.Columns[1].DataType, Is.EqualTo(typeof(decimal)));
Assert.That(dt.Columns[2].Caption, Is.EqualTo("KeyField"));
Assert.That(dt.Columns[2].DataType, Is.EqualTo(typeof(int)));
Assert.That(dt.Columns[3].Caption, Is.EqualTo("ANullableGuidField"));
Assert.That(dt.Columns[3].DataType, Is.EqualTo(typeof(Guid)));
Assert.That(dt.Columns[3].AllowDBNull, Is.True);
Assert.That(dt.Columns.Count, Is.EqualTo(4));
}
[Test]
public void ToDataTableContainsAllElements()
{
var dt = _testObjects.ToDataTable();
Assert.That(dt.Rows.Count, Is.EqualTo(_testObjects.Count));
}
[Test]
public void ToDataTableWithExpression()
{
var dt = _testObjects.ToDataTable(t => t.AString);
Assert.That(dt.Columns[0].Caption, Is.EqualTo("AString"));
Assert.That(dt.Columns[0].DataType, Is.EqualTo(typeof(string)));
Assert.That(dt.Columns.Count, Is.EqualTo(1));
}
[Test]
public void ToDataTableWithSchema()
{
using var dt = new DataTable();
var columns = dt.Columns;
_ = columns.Add("Column1", typeof(int));
_ = columns.Add("Value", typeof(string));
_ = columns.Add("Column3", typeof(int));
_ = columns.Add("Name", typeof(string));
var vars = Environment.GetEnvironmentVariables()
.Cast<DictionaryEntry>()
.ToArray();
_ = vars.Select(e => new { Name = e.Key.ToString(), Value = e.Value!.ToString() })
.ToDataTable(dt, e => e.Name, e => e.Value);
var rows = dt.Rows.Cast<DataRow>().ToArray();
Assert.That(rows.Length, Is.EqualTo(vars.Length));
Assert.That(rows.Select(r => r["Name"]).ToArray(), Is.EqualTo(vars.Select(e => e.Key).ToArray()));
Assert.That(rows.Select(r => r["Value"]).ToArray(), Is.EqualTo(vars.Select(e => e.Value).ToArray()));
}
readonly struct Point
{
#pragma warning disable CA1805 // Do not initialize unnecessarily (avoids CS0649)
public static Point Empty = new();
#pragma warning restore CA1805 // Do not initialize unnecessarily
public bool IsEmpty => X == 0 && Y == 0;
public int X { get; }
public int Y { get; }
public Point(int x, int y) : this() { X = x; Y = y; }
}
[Test]
public void ToDataTableIgnoresStaticMembers()
{
var points = new[] { new Point(12, 34) }.ToDataTable();
Assert.That(points.Columns.Count, Is.EqualTo(3));
var x = points.Columns["X"];
var y = points.Columns["Y"];
var empty = points.Columns["IsEmpty"];
Assert.That(x, Is.Not.Null);
Assert.That(y, Is.Not.Null);
Assert.That(empty, Is.Not.Null);
var row = points.Rows.Cast<DataRow>().Single();
Assert.That(row[x], Is.EqualTo(12));
Assert.That(row[y], Is.EqualTo(34));
Assert.That(row[empty], Is.False);
}
}
}